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Finding the Fourth Proportional to 7,231.63, 9,979.65 and 3,919.63

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Solution

The fourth proportional to 7,231.63, 9,979.65 and 3,919.63 is: 5,409.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,231.63 : 9,979.65 = 3,919.63 : x
  2. Step 2: Convert to fraction form
    7,231.63/9,979.65 = 3,919.63/x
  3. Step 3: Cross multiply
    7,231.63x = 9,979.65 × 3,919.63
  4. Step 4: Simplify right side
    7,231.63x = 39,116,466.03
  5. Step 5: Solve for x
    x = 39,116,466.03/7,231.63
  6. Step 6: Final answer
    x = 5,409.08

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.